TEMPORAL AND SPATIAL ANALYSIS OF REGIONAL COMP-OSITE FAULT PLANE SOLUTIONS FOR SMALL EARTHQUAKES

A method is proposed in this paper for the analysis of temporal and spatial characteristics of composite fault plane solutions for small earthquakes. With this method, an interesting region is divided into small areas according to the geological features of the region. As an example, 107 composite fault plane solutions are calculated for the adjoining region of Shanxi, Hebei and Nei Monggol- The temporal and spatial characteristics of the variations of the solution parameters before and after the great Tangshan earthquake of July 28, 1976, have been analysed and some interesting results obtained.